Radiodial



Dec. 29, 1925- 1,567,963

J. LUPO, JR

RADIO DIAL Filed April '15, 1925 WITNESSES 7 INVENTORM ATTORNEYS Patented Dec. 29, 1925.

um'rso STATES PATENT OFFICE.

JOSE PH LUPO, JR., NEW YORK, N. Y.

nAnIonIAL.

Application filed April 15, 1925. Serial No. 23,295.

To all whom it may concern:

Be it known that I, JOSEPH LUro, Jr., a citizen of the United States of America, and resident of the city of New York, borough 1 of the Bronx, in the county of Bronx and able'attachment for the dial uponwhich the stations and their wave lengths are recorded specification and-drawings in'which there State of New York, have invented a new and Improved Radiodial, ofwhich the following is a full, clear, and exact description.

This invention relates to radio receiving apparatus and pertains more particularly to a guide means for attachment. to the dials for accurately tuning the set to select the garious broadcasting stations within its ra- As an object the invention contemplatesan indicating means constituting a removis exhibited one example or embodiment of the invention which is in no wa intended as a limitation upon the scope of t eappended claims as it is to be clearly understood that variations and modifications which properly fall within the scope of sald clalms may be resorted to when found expedient. I

In the drawings- Figure 1 is a face view of a dial constructed in accordance with the invention and equipped with the indicating attachment.

Fig. 2 is a cross sectional view therethrough taken approximately on the line 22 of Fig. 1. I Fig. 3 is a fragmentary cross sectional view on an enlarged scale.

Referring to the drawings by characters of reference designates-generally a radio dial constituting means for manipulating the tuning apparatus of a receiving set and which includes the manipulating knob portion 11 and the annular flange 12. In carrying the present invention into practice ithe flange 12 is provided with an annular recess 13 on its outer face, the inner and outer .ode-

. fining walls of which are under-cut or beveled as at 14 and 15 to provide a restricted entrance mouth. An annular sheet or disk of material 16 such as cardboard or the like is provided to snugly fit within the groove 13 and to constitute an indicia bearin element upon which the indicia 17 is ra ially disposed from the axial center, which indicia consists of the code names of the broadcasting stations and their wave lengths properly arranged with respect to the grad- V nations 19 on the edge of the dial flange whereby upon manipulating the dial to bring the various indlcia in registry with a scale mark 20 on the panel the set is correspondingly tuned with the station. In order to,protect the face of the disk 16, a trans-- parent annular disk of celluloid or any other suitable transparent material21 conforming in size and configuration to the disk 16 is arranged over said diskand within the cove 13. In order to maintain the said disks in I properly related position within the groove 13 and against accidental displacement the width between the inner and outer eripheries of the disks is slightly greater than the width of the restricted mouth formed by the under-cut or beveled inner and outer walls of the groove. In order to prevent relative rotation of the disks with respect to the. dial and to insure proper replacing of the disks when removed, a pin,'screw or other headed device 22 projects upwardly from the bottom of the oove 13 for interchangeable association with the keyhole slots 23 formed in the disks 16 and 21.

I claim.

As a new article of manufacture a radio dial including a knob and an integral flange having an annular groove in the outer face thereof of dove-tail shape .in cross section for the reception of, an annular disk constituting an indicia bearing element.

JOSEPH, LUPO, JR 

